I have a Google voice number. You actually can’t. You can get spam filtering which works sort of but definitely not in the same way. I have never had a Voice call use Google’s call screening on graphene os for instance because it doesn’t work. I have graphene os running on a pixel 8 pro for the purposes of seeing what works and doesn’t work to see if I can ever daily drive it. I like graphene os a lot but rely too much on certain Google specific android features and that’s what my first comment was generally talking about.